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Open Access Knowledge and Scholarship

Date of Award


Culminating Project Type


Degree Name

Biological Sciences - Ecology and Natural Resources: M.S.




College of Science and Engineering

First Advisor

Alfred J. Hopwood

Second Advisor

Ralph W. Gunderson

Third Advisor

Chester W. Buckley

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.


Two different laboratory streams were.used to examine the life cycles of Hydropsyche bifida and H. morosa (Trichoptera:Hydropsychidae). Effectiveness of the artificial streams was determined. Hydropsyche bifida and H. morosa were shown to be useful bioassay organisms. Variations of the species-specific larval head patterns were drawn for both H. oifida and H. morosa.

Field studies were used to determine niche·separations for H. bifida and H. morosa in riffle areas of the Sauk River, St. Cloud, Minnesota. Physical-spatial factors such as retreat material, substrate preference, area of riffle and location on substrate were used to evaluate thi's separation. Eggs found in the river were indistin-· guishable from laboratory eggs obtained. The river eggs developed and photographs were made of the first instar, tentatively identified as Hydropsyche sp.

OCLC Number


Included in

Biology Commons



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